goldduster,
I read your other post and this post. Frankly, given that your marriage is soo young, and that you and W are not children, I would say leave her. This may shock you given that you have signed on to marriagebuilders. I have been here a long time and I am very pro-marriage, but you have never really been married to this woman.
I guess a reasonable question to ask her is why she married you given that she obviously still prefers ex. Life is too short to deal with this given that if my calculations are right, you have been married a total of 8 months, and she has already had an affair and may be pregnant by your or OM. Frankly from what you described on the other post I doubt she is pregnant, but who knows, I sure don't.
You have given her a chance, you have tried to work through her A, but she has not really responded has she? You will find people here who work much longer than the 3-4 months that you have to rebuild after an A, but then they weren't married 5 months and very likely the A began even before the marriage.
Now there are a few here that have indeed been cheated on before and during the beginning of their marriage, and have rebuilt. You can do that if your W is willing. But, in the case of at least on lady her H had really never completed dealing with what his former W had done to him. You might say extenuating circumstance.
Seriously, the choice is really yours. If you decide to rebuild and want help all here will do their best, but I would strongly recommend that you and your W have Marriage counseling with someone that has their head screwed on straight, not some feel good person. I think the Harleys would be a good choice, but you can probably find someone where you live.
Normally, I would say to Plan A and see where you have failed, but I doubt you even had a chance to fail as an H. This makes things even harder.
So stop and really think. Do you want to save this marriage? If you do, then there is a lot of reading for you to do here. But, I suspect that you will find that there are many other woman out there for you and most of them won't be cheating on you before or just after you get married.
God Bless,
JL